In view of the difficulty found in an accurate simulation of the change of working conditions of vehicle power battery, the quasi-PR (proportional resonance) control strategy has been adopted to realize the precise and stable control of the two-way PWM rectifier module at the front end of the power battery simulation power supply. With the matching design steps of the parameters of the quasi-PR controller and the parameters of the simulation power supply system given, an analysis has thus been made of the response speed of the front-end inductance and back-end capacitance of the PWM module to the simulation power supply, combined with the influence of the stability and the bi-directional DC/DC converter module, thus establishing the overall model of analog power supply. The simulation results show that the simulation power supply can accurately simulate the charging and discharging characteristics of the vehicle power battery under different working conditions, and meet the requirements of the vehicle test platform for a wide range of dynamic testing platform with little impact on the power grid.